Wiring Diagrams

Aircraft Electronics Prints

Computer Logic

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serve as information for maintenance and repair in the same way as those in shipboard electronics systems. Detailed block diagrams of complicated systems that contain details of signal paths, wave shapes, and so on are usually called signal flow diagrams. Wiring Diagrams Aircraft electronic wiring diagrams fall into two basic classes: chassis wiring diagrams and interconnect- ing diagrams. There are many variations of each class, depending on the application. Figure 6-20, view A, shows an example of one type of chassis wiring diagram. This diagram shows the physical layout of the unit and all component parts and interconnecting tie points. Each indicated part is identified by a reference designation number that helps you use the illustrated parts breakdown (IPB) to deter- mine value and other data. (Wiring diagrams normally do not show the values of resistors, capacitors, or other components.) Since this specific diagram shows physical layout and dimensioning details for mounting holes, it could be used as an assembly drawing and as an installation drawing. Figure 6-20, view B, shows the reverse side of the same mounting board, together with the wiring inter- connections to other components. It does not show the actual positioning of circuit components, and it shows wire bundles as single lines with the separate wires entering at an angle. The wire identification coding on this diagram con- sists of a three-part designation. The first part is a number representing the color code of the wire accord- ing to Military Specification MIL-W-76B. (Many other chassis wiring diagrams designate color coding by abbreviation of the actual colors.) The second part is the reference part designation number of the item to which the wire is connected, and the last part is the designation of the terminal to which connection is made. Figure 6-20, view C, is not a wiring diagram, but it illustrates a method commonly used to show some functional aspect of sealed or special components. Figure 6-20, view D, illustrates several methods used to show connections at terminal strips, as discussed earlier. Electromechanical Drawings Electromechanical devices such as synchros, gyros, accelerometers, autotune systems, an analog computing elements are quite common in avionics systems. You need more than an electrical or electronic drawing to understand these systems adequately; therefore, we use a combination drawing called an electromechanical drawing. These drawings are usually simplified both electrically and mechan- ically, and show only those items essential to the operation. Figure 6-21 shows an example of one type of electromechanical drawing. Figure 6-21.—Aircraft gyro fluxgate compass, electromechanical drawing. 6-21

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